Study on Water Electrolysis for Oxygen Production -Reduction of Water Circulation and Gas-Liquid Separator-



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47th International Conference on Environmental Systems


The Japan Aerospace Exploration Agency (JAXA) has been studying, and developing the Environmental Control and Life Support System (ECLSS). In particular, an air regeneration system to support long-duration manned space missions beyond Earth's orbit. One of our goals is to develop an air regeneration system that is lightweight, compact, and highly energy efficiency. The air regeneration system is comprised of; a water electrolysis subsystem for oxygen generation1, a CO2 removal subsystem, and a CO2 reduction subsystem. In this paper, we report on improvements to the water electrolysis subsystem for the oxygen generation system. The water electrolysis cell uses a solid polymer electrolyte (SPE) developed by JAXA, and a water/gas separator to separate generated hydrogen from circulated water using a membrane. We also attempted to improve a subsystem including an electrolyzer, a water circulation and water/gas separation function by removing a water circulation and an independent separator. As a result, we succeeded in creating a simple and lightweight subsystem.


Masato Sakurai, Japan Aerospace Exploration Agency (JAXA), Japan
ICES302: Physio-chemical Life Support- Air Revitalization Systems -Technology and Process Development
The 47th International Conference on Environmental Systems was held in South Carolina, USA on 16 July 2017 through 20 July 2017.


ECLSS, Oxygen Generation, Water Electrolysis